BIOLOGY A LEVEL

[Lana19984]

10. Which of the following genotypes would produce the smallest number of different gametes if the alleles are assorted independently?
A) aa BB Dd
B) AA BB DD
C) Aa Bb DD
D) Aa BB DD
E) Aa Bb Dd

11. Which of the following processes can decrease the genetic variation in natural populations?
A) recombination B) immigration C) mutagenesis D) inbreeding E) hybridization

12. Which of the following structures present in the embryos of higher plants develops into primary leaves of seedlings?
A) epicotyl B) endosperm C) radicle D) hypocotyl E) cotyledon

can anybody please answer those and maybe explain ?

 

[qwertypoiu]

10. Which of the following genotypes would produce the smallest number of different gametes if the alleles are assorted independently?
A) aa BB Dd
B) AA BB DD
C) Aa Bb DD
D) Aa BB DD
E) Aa Bb Dd

11. Which of the following processes can decrease the genetic variation in natural populations?
A) recombination B) immigration C) mutagenesis D) inbreeding E) hybridization

12. Which of the following structures present in the embryos of higher plants develops into primary leaves of seedlings?
A) epicotyl B) endosperm C) radicle D) hypocotyl E) cotyledon

can anybody please answer those and maybe explain ?

I do not think that this is CIE A level biology syllabus material.

I can answer question 10. It should be B. All the gametes will have A B D genotypes. Simply because there are no other haploid cells that could be formed.

The rest I'm not sure of sorry. I believe primary leaves of seedlings develop from cotyledons. A decrease in genetic variation can only be caused by inbreeding I guess.

 

[Lana19984]

I do not think that this is CIE A level biology syllabus material.

I can answer question 10. It should be B. All the gametes will have A B D genotypes. Simply because there are no other haploid cells that could be formed.

The rest I'm not sure of sorry. I believe primary leaves of seedlings develop from cotyledons. A decrease in genetic variation can only be caused by inbreeding I guess.

thank you ,

do you know about this one ?
Which of the following statements is true?

I.pH of urine is close to neutral (7).
II. Urine is a liquid product of the body that is secreted by urinary system.
III. Lack of vasopressin in the blood increases diuresis.
A) I B) II C) I, II, III D) III E) I, III

 

[qwertypoiu]

S

thank you ,

do you know about this one ?
Which of the following statements is true?

I.pH of urine is close to neutral (7).
II. Urine is a liquid product of the body that is secreted by urinary system.
III. Lack of vasopressin in the blood increases diuresis.
A) I B) II C) I, II, III D) III E) I, III

Sorry I'm not sure about this question

 

[cool Hassan]

Answer is E most probably. Urine is usually acidic of pH about 6. And lack of ADH(vasopressin) causes diabetes insipidus which supports diuresis

thank you ,

do you know about this one ?
Which of the following statements is true?

I.pH of urine is close to neutral (7).
II. Urine is a liquid product of the body that is secreted by urinary system.
III. Lack of vasopressin in the blood increases diuresis.
A) I B) II C) I, II, III D) III E) I, III

 

[cool Hassan]

10. Which of the following genotypes would produce the smallest number of different gametes if the alleles are assorted independently?
A) aa BB Dd
B) AA BB DD
C) Aa Bb DD
D) Aa BB DD
E) Aa Bb Dd

11. Which of the following processes can decrease the genetic variation in natural populations?
A) recombination B) immigration C) mutagenesis D) inbreeding E) hybridization

12. Which of the following structures present in the embryos of higher plants develops into primary leaves of seedlings?
A) epicotyl B) endosperm C) radicle D) hypocotyl E) cotyledon

can anybody please answer those and maybe explain ?

10:B is answer only one combination ABD is possible
11 D is the answer because inbreeding causes inbreeding depression due to increased homozygosity, which reduces the genetic variation in a population
12: I have no knowledge about it